The Battle of Gatae was an engagement fought in roughly 103 AD during the Roman Emperor Trajan's war with the kingdom of Dacia. There is no serious historical evidence giving an exact place or time to the battle, nor any troop positions, numerical statistics, casualties, or much of anything of that nature. It is not even fully understood if the battle was in of itself a major engagement or merely a small battle or even a large skirmish. Dio Cassius gives a minor mention of the battle, but it is a mere mention.